<html>
<head>
  <meta charset="UTF-8">
  <title>Traceback</title>
  <style>
    .queried{
      margin-top: 0.5em;
      background: skyblue;
    }
    .caller{
      margin-top: 0.5em;
    }
    .endpoint{
      border: 1px solid lightgreen;
      padding: 1px;
    }
    .potential{
      background: lightgray;
    }
    .error{
      color: red;
    }
  </style>
</head>
<body>
%s
</body>
</html>